EP1580334A1 - Method of controlling travel of construction heavy equipment with electronic joysticks - Google Patents
Method of controlling travel of construction heavy equipment with electronic joysticks Download PDFInfo
- Publication number
- EP1580334A1 EP1580334A1 EP04027943A EP04027943A EP1580334A1 EP 1580334 A1 EP1580334 A1 EP 1580334A1 EP 04027943 A EP04027943 A EP 04027943A EP 04027943 A EP04027943 A EP 04027943A EP 1580334 A1 EP1580334 A1 EP 1580334A1
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- EP
- European Patent Office
- Prior art keywords
- joystick
- manipulation
- travel
- heavy equipment
- joysticks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2004—Control mechanisms, e.g. control levers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
- B62D11/001—Steering non-deflectable wheels; Steering endless tracks or the like control systems
- B62D11/003—Electric or electronic control systems
Definitions
- the present invention generally relates to a method of controlling travel of construction heavy equipment with electronic joysticks, with which a driver can control the travel of the construction heavy equipment in a comfort sitting posture.
- the present invention specifically relates to a method of controlling travel of construction heavy equipment with electronic joysticks, capable of selectively driving a working unit and a traveling unit by using the electronic joysticks for the working unit such as a boom, an arm or so forth.
- construction heavy equipment such as an excavator makes use of an acceleration pedal or a travel lever connected with the acceleration pedal which is for performing travel operation, and a manipulation lever, such as a joystick, for a working unit such as a boom, an arm, a bucket, a swing unit or so forth.
- a manipulation lever such as a joystick
- an electronic joystick is widely used as the manipulation lever, wherein the joystick outputs a signal in proportion to a quantity of manipulation caused by a driver or operator.
- the signal outputted from the joystick may be an analog voltage signal, a PWM (Pulse Width Modulation) signal, a communication signal, etc.
- Various working units including the swing unit and the traveling unit are driven by a hydraulic fluid supplied from a hydraulic pump operated by an engine.
- a control unit controls a direction and a flow rate of a hydraulic fluid supplied to the working units by controlling various control valves according to the manipulation quantity of the manipulation lever, so that the working units and the traveling unit are driven.
- the driver In order to make the heavy equipment travel, the driver has either to press the acceleration pedal with his/her foot or to manipulate the travel lever connected with the acceleration pedal with his/her hand.
- the driver manipulates the joystick for the working unit, he/she can work in a state where he/she assumes a comfortable posture on the driver's seat.
- the travel lever installed a little apart in front of the driver's seat is manipulated, the driver must manipulate the travel lever in a state where he/she leans forward in the driver's seat to a certain degree.
- the driver During long-distance traveling, the driver must step on the acceleration pedal under continuous application of a constant force. For this reason, the travel lever is used instead of the acceleration pedal. In this case, the driver must lean forward in the driver's seat for a long time. Thus, the driver easily feels tired.
- a manipulation lever for a traveling unit has been installed around a joystick for a working unit.
- the manipulation lever must be installed separately from a hydraulic line, so that the configuration becomes complicated and production costs are increased.
- a control valve has been installed on a pilot signal line connected to a joystick of a working unit.
- a pilot signal pressure of the joystick being supplied to the working unit is adapted to be supplied to a traveling unit, so that any one of the working unit and the traveling unit is selectively driven by using the joystick.
- the present invention provides a method for controlling travel of construction heavy equipment with joysticks, in which the construction heavy equipment has boom and arm joysticks outputting first manipulation signals according to quantities of manipulation in order to drive a boom and an arm, left and right acceleration pedals outputting second manipulation signals according to quantities of manipulation in order to drive left and right traveling units, a plurality of control valves controlling hydraulic fluid supplied to each of the boom, the arm and the left and right traveling units, and a plurality of electronic proportional valves operated by control signals outputted from a controller to control each of the control valves.
- the method comprises the steps of: inputting a joystick travel function selection signal, the first manipulation signals generated by the joysticks and the second manipulation signals generated by the acceleration pedals into the controller; determining whether a joystick travel function is selected or released from the joystick travel function selection signal; when the joystick travel function is selected, performing long-distance travel by preventing the control signal according to the second manipulation signals of the acceleration pedals from being outputted, by outputting the control signal according to the first manipulation signal of the arm joystick to the electronic proportional valves connected to the control valve for controlling the left traveling motor and by outputting the control signal according to the first manipulation signal of the boom joystick to the electronic proportional valves connected to the control valve for controlling the right traveling motor; and when the joystick travel function is released, performing a work by outputting the control signal according to the first manipulation signal of the arm joystick to the electronic proportional valves connected to the control valve for controlling an arm cylinder, by outputting the control signal according to the first manipulation signal of the boom joystick to the electronic proportional valves connected to the control valve
- the construction heavy equipment is provided with a display device for displaying information of the construction heavy equipment to a driver, and the method further comprises the steps of; when the joystick travel function is selected, displaying a state of the selected travel function and a warning message on the display device; and when the joystick travel function is released, releasing the state of the selected travel function and the warning message from the display device.
- a secondary pressure characteristic of the electronic proportional valves based on the manipulation quantities of the joysticks is controlled in a parabolic form in order to improve precise manipulation capability of the joysticks and to prevent impact from being generated on travel starting of the construction heavy equipment.
- Fig. 1 is a flow chart showing a method for controlling travel of construction heavy equipment with electronic joysticks in accordance with the present invention
- Fig. 2 is a hydraulic circuit diagram of a system used in a method for controlling travel of construction heavy equipment with electronic joysticks in accordance with the present invention.
- Fig. 3 is a graph showing a relation between a quantity of manipulation of joysticks and a secondary pressure of electronic proportional valves in accordance with the present invention.
- heavy equipment is provided with hydraulic pumps 20 and 20a and a pilot pump 30 which are driven by an engine E.
- the boom (not shown) is driven by a boom cylinder 40.
- the arm (not shown) is driven by an arm cylinder 40a.
- a driver manipulates a boom joystick 70 and an arm joystick 70a to move the boom and the arm, so that a desired work can be performed.
- the heavy equipment is provided with left and right traveling motors 50 and 50a as left and right traveling units.
- the left and right traveling motors 50 and 50a are driven. Thereby, the travel of the heavy equipment is performed.
- Control valves 60, 60a, 60b and 60c respectively supply hydraulic fluid discharged from the hydraulic pumps 20 and 20a to the boom cylinder 40, the arm cylinder 40a, and the left and right traveling motors 50 and 50a,.
- the control valves 60, 60a, 60b and 60c are operated by electronic proportional valves 90 and 90a to 90g, thus controlling flow direction and rate of the hydraulic fluid of the hydraulic pumps 20 and 20a.
- the boom cylinder 40, the arm cylinder 40a, and the left and right traveling motors 50 and 50a are controlled by the control valves.
- the electronic proportional valves 90 and 90a to 90g are connected to the pilot pump 30, and supply a pilot signal pressure from the pilot pump 30 to the control valves 60, 60a, 60b and 60c, thereby operating the control valves. Further, the electronic proportional valves 90 and 90a to 90g are connected to a controller 100. When control signals are inputted from the controller 100, the electronic proportional valves are operated.
- the controller 100 receives manipulation signals generated according to a quantity of manipulation of the joysticks 70 and 70a and the acceleration pedals 70b and 70c, thereby outputting control signals to the respective electronic proportional valves 90 and 90a to 90g.
- 120 and 120a refer to pump flow rate controlling means for a pump discharge flow rate by controlling displacement of the hydraulic pumps 20 and 20a with the control signals inputted from the controller 100
- 110 refers to a display device for displaying various information of the heavy equipment to the driver.
- a method for controlling travel of heavy equipment with a joystick in accordance with the present invention comprises a signal inputting step S100, a function selection determining step S200, a travel function displaying step S300, a long-distance traveling step S400, a display releasing step S500, and a work performing step S600, as shown in Fig. 1.
- the joystick travel function selection signal is generated by a function setting means 80.
- a function setting means 80 a communication apparatus or on/off switch (not shown) may be used.
- the controller 100 determines whether a joystick travel function is selected or released.
- the controller 100 displays a state where the joystick travel function is selected and a warning message on a display device 110, thereby informing driver that the joystick travel function is running.
- the driver can manipulate the arm joystick 70a to drive a left traveling motor 50, and can manipulate the boom joystick 70 to drive a right traveling motor 50a. Therefore, at this time, the driver manipulates the joysticks 70 and 70a instead of the acceleration pedals 70b and 70c to control the travel of the heavy equipment.
- the controller 100 outputs a manipulation signal according to a quantity of manipulation of the arm joystick 70a to electronic proportional valves 90d and 90e for the left traveling motor, and outputs a manipulation signal according to a quantity of manipulation of the boom joystick 70 to electronic proportional valves 90f and 90g for the right traveling motor.
- the manipulation signals inputted into the controller 100 according to quantities of manipulation of the acceleration pedals 70b and 70c are neglected, so that the manipulation signals are not outputted from the controller 100 to the outside.
- the controller 100 releases the selected joystick travel function state and the warning message which have been displayed on a display device 110, thereby informing the driver that the joystick travel function is released.
- the driver can manipulate the joysticks 70 and 70a to drive the boom and the arm, and can manipulate the acceleration pedals 70b and 70c to control the travel of the heavy equipment.
- the controller 100 outputs a control signal according to the manipulation signal of the arm joystick 70a to electronic proportional valves 90b and 90c for an arm cylinder, outputs a control signal according to the manipulation signal of the boom joystick 70 to electronic proportional valves 90 and 90a for a boom cylinder, and outputs control signals according to the manipulation signals of the acceleration pedals 70b and 70c to electronic proportional valves 90d, 90e, 90f and 90g for the traveling motors.
- a general characteristic of a secondary pressure of the electronic proportional valves is plotted by a dotted line 'b' on a graph of Fig. 3.
- the dotted line 'b' indicates the characteristic of the secondary pressure at which hydraulic fluid is linearly supplied to control valves 60b and 60c for the traveling motors according to the quantities of manipulation of the joysticks 70 and 70a.
- a solid line 'a' on a graph of Fig. 3 corresponds to an example modified in such a way that, when the joystick travel function is selected, the secondary pressure characteristic of the electronic proportional valves is controlled in a parabolic form in order to improve precise manipulation capability and prevent impact on starting the travel.
- the driver manipulates the joysticks 70 and 70a to drive the left and right traveling motors 50 and 50a, thereby being capable of traveling the heavy equipment. Therefore, it is possible to give the driver convenience of manipulation.
- the method for controlling the travel of the heavy equipment with the joystick in accordance with the present invention has advantages as follows:
- the working unit such as the boom and the arm and the traveling unit can be selectively driven by using the electronic joystick.
- the driver can control the travel of the construction heavy equipment in a comfort sitting posture.
- it is possible not only to increase convenience of manipulation, but also to maintain a correct driving posture during long-distance traveling. Thereby, it is possible to remarkably reduce a fatigue of the driver.
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Operation Control Of Excavators (AREA)
- Mechanical Control Devices (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
Disclosed is a method for controlling travel of construction heavy equipment with electronic joysticks (70a,70). The method includes the steps of; inputting a joystick travel function selection signal (80), first manipulation signals of the joysticks (70a,70) and second manipulation signals of acceleration pedals (70b,70c) into a controller (100); determining whether a joystick travel function (80) is selected or released; when the joystick travel function (80) is selected, performing long-distance travel; and when the joystick travel function is released, performing a work. The working unit such as the boom and the arm and the traveling unit can be selectively driven by using the electronic joystick (70,70a). Thus, the driver can control the travel of the construction heavy equipment in a comfort sitting posture.
Description
The present invention generally relates to a method of controlling travel of
construction heavy equipment with electronic joysticks, with which a driver can control
the travel of the construction heavy equipment in a comfort sitting posture.
The present invention specifically relates to a method of controlling travel of
construction heavy equipment with electronic joysticks, capable of selectively driving a
working unit and a traveling unit by using the electronic joysticks for the working unit
such as a boom, an arm or so forth.
In general, construction heavy equipment such as an excavator makes use of
an acceleration pedal or a travel lever connected with the acceleration pedal which is for
performing travel operation, and a manipulation lever, such as a joystick, for a working
unit such as a boom, an arm, a bucket, a swing unit or so forth.
Currently, an electronic joystick is widely used as the manipulation lever,
wherein the joystick outputs a signal in proportion to a quantity of manipulation caused
by a driver or operator. The signal outputted from the joystick may be an analog
voltage signal, a PWM (Pulse Width Modulation) signal, a communication signal, etc.
Various working units including the swing unit and the traveling unit are
driven by a hydraulic fluid supplied from a hydraulic pump operated by an engine. A
control unit controls a direction and a flow rate of a hydraulic fluid supplied to the
working units by controlling various control valves according to the manipulation
quantity of the manipulation lever, so that the working units and the traveling unit are
driven.
In order to make the heavy equipment travel, the driver has either to press
the acceleration pedal with his/her foot or to manipulate the travel lever connected with
the acceleration pedal with his/her hand. When the driver manipulates the joystick for
the working unit, he/she can work in a state where he/she assumes a comfortable
posture on the driver's seat. However, when the travel lever installed a little apart in
front of the driver's seat is manipulated, the driver must manipulate the travel lever in a
state where he/she leans forward in the driver's seat to a certain degree.
During long-distance traveling, the driver must step on the acceleration pedal
under continuous application of a constant force. For this reason, the travel lever is
used instead of the acceleration pedal. In this case, the driver must lean forward in the
driver's seat for a long time. Thus, the driver easily feels tired.
According to a prior art for overcoming these drawbacks, a manipulation
lever for a traveling unit has been installed around a joystick for a working unit. With
this configuration, the manipulation lever must be installed separately from a hydraulic
line, so that the configuration becomes complicated and production costs are increased.
According to another prior art, a control valve has been installed on a pilot
signal line connected to a joystick of a working unit. When the control valve is
switched, a pilot signal pressure of the joystick being supplied to the working unit is
adapted to be supplied to a traveling unit, so that any one of the working unit and the
traveling unit is selectively driven by using the joystick.
However, according to these prior arts, a configuration of a hydraulic circuit
becomes complicated, and thereby production costs are increased. Further, there is a
limitation that this configuration can not be applied to the state-of-the-art heavy
equipment where all the units of the heavy equipment are controlled by electrical and
electronic signals from an electronic proportional valve etc.
Therefore, it is an object of the present invention to provide a method of
controlling travel of construction heavy equipment, by which a driver can control the
travel of the construction heavy equipment in a comfort sitting posture.
It is another object to selectively drive a working unit and a traveling unit
using electronic joysticks for the working unit such as a boom, an arm or so forth.
In order to accomplish these object, the present invention provides a method
for controlling travel of construction heavy equipment with joysticks, in which the
construction heavy equipment has boom and arm joysticks outputting first manipulation
signals according to quantities of manipulation in order to drive a boom and an arm, left
and right acceleration pedals outputting second manipulation signals according to
quantities of manipulation in order to drive left and right traveling units, a plurality of
control valves controlling hydraulic fluid supplied to each of the boom, the arm and the
left and right traveling units, and a plurality of electronic proportional valves operated
by control signals outputted from a controller to control each of the control valves. The
method comprises the steps of: inputting a joystick travel function selection signal, the
first manipulation signals generated by the joysticks and the second manipulation
signals generated by the acceleration pedals into the controller; determining whether a
joystick travel function is selected or released from the joystick travel function selection
signal; when the joystick travel function is selected, performing long-distance travel by
preventing the control signal according to the second manipulation signals of the
acceleration pedals from being outputted, by outputting the control signal according to
the first manipulation signal of the arm joystick to the electronic proportional valves
connected to the control valve for controlling the left traveling motor and by outputting
the control signal according to the first manipulation signal of the boom joystick to the
electronic proportional valves connected to the control valve for controlling the right
traveling motor; and when the joystick travel function is released, performing a work by
outputting the control signal according to the first manipulation signal of the arm
joystick to the electronic proportional valves connected to the control valve for
controlling an arm cylinder, by outputting the control signal according to the first
manipulation signal of the boom joystick to the electronic proportional valves connected
to the control valve for controlling an boom cylinder and by outputting the control
signal according to the second manipulation signals of the acceleration pedals to the
electronic proportional valves for the traveling motors.
Here, preferably, the construction heavy equipment is provided with a
display device for displaying information of the construction heavy equipment to a
driver, and the method further comprises the steps of; when the joystick travel function
is selected, displaying a state of the selected travel function and a warning message on
the display device; and when the joystick travel function is released, releasing the state
of the selected travel function and the warning message from the display device.
Preferably, in the step of performing the long-distance travel, a secondary
pressure characteristic of the electronic proportional valves based on the manipulation
quantities of the joysticks is controlled in a parabolic form in order to improve precise
manipulation capability of the joysticks and to prevent impact from being generated on
travel starting of the construction heavy equipment.
The above aspects and features of the present invention will be more
apparent by describing certain embodiments of the present invention with reference to
the accompanying drawings, in which:
Fig. 1 is a flow chart showing a method for controlling travel of construction
heavy equipment with electronic joysticks in accordance with the present invention;
Fig. 2 is a hydraulic circuit diagram of a system used in a method for
controlling travel of construction heavy equipment with electronic joysticks in
accordance with the present invention; and
Fig. 3 is a graph showing a relation between a quantity of manipulation of
joysticks and a secondary pressure of electronic proportional valves in accordance with
the present invention.
Hereinafter, a configuration and operation of an industrial vehicle according
to the present invention will be described in more detail through exemplary
embodiments of accompanying drawings.
As shown in Fig. 2, heavy equipment is provided with hydraulic pumps 20
and 20a and a pilot pump 30 which are driven by an engine E.
On the heavy equipment, working units such as a boom and an arm are
mounted. The boom (not shown) is driven by a boom cylinder 40. The arm (not
shown) is driven by an arm cylinder 40a. A driver manipulates a boom joystick 70 and
an arm joystick 70a to move the boom and the arm, so that a desired work can be
performed.
Further, the heavy equipment is provided with left and right traveling motors
50 and 50a as left and right traveling units. When the driver manipulates acceleration
pedals 70b and 70c, the left and right traveling motors 50 and 50a are driven. Thereby,
the travel of the heavy equipment is performed.
The electronic proportional valves 90 and 90a to 90g are connected to the
pilot pump 30, and supply a pilot signal pressure from the pilot pump 30 to the control
valves 60, 60a, 60b and 60c, thereby operating the control valves. Further, the
electronic proportional valves 90 and 90a to 90g are connected to a controller 100.
When control signals are inputted from the controller 100, the electronic proportional
valves are operated.
The controller 100 receives manipulation signals generated according to a
quantity of manipulation of the joysticks 70 and 70a and the acceleration pedals 70b and
70c, thereby outputting control signals to the respective electronic proportional valves
90 and 90a to 90g.
Among reference numbers in the figures, 120 and 120a refer to pump flow
rate controlling means for a pump discharge flow rate by controlling displacement of
the hydraulic pumps 20 and 20a with the control signals inputted from the controller
100, and 110 refers to a display device for displaying various information of the heavy
equipment to the driver.
Hereinafter, an example of using a method for controlling travel of heavy
equipment with a joystick in accordance with the present invention will be described in
detail with reference to the attached drawings.
A method for controlling travel of heavy equipment with a joystick in
accordance with the present invention comprises a signal inputting step S100, a function
selection determining step S200, a travel function displaying step S300, a long-distance
traveling step S400, a display releasing step S500, and a work performing step S600, as
shown in Fig. 1.
In the signal inputting step S100, two kinds of signals, namely a joystick
travel function selection signal (signal of selecting a function of allowing travel to be
controlled by joysticks 70 and 70a) and manipulation signals for controlling a working
unit such as a boom and an arm through the joysticks 70 and 70a and for controlling
travel through acceleration pedals 70b and 70c, are inputted into a controller 100.
The joystick travel function selection signal is generated by a function
setting means 80. As the function setting means 80, a communication apparatus or
on/off switch (not shown) may be used.
In the function selection determining step S200, the controller 100
determines whether a joystick travel function is selected or released.
As a result of determination in the foregoing function selection determining
step S200, when the joystick travel function is selected, the travel function displaying
step S300 and the long-distance traveling step S400 are sequentially performed.
In the travel function displaying step S300, the controller 100 displays a state
where the joystick travel function is selected and a warning message on a display device
110, thereby informing driver that the joystick travel function is running.
In the long-distance traveling step S400, the driver can manipulate the arm
joystick 70a to drive a left traveling motor 50, and can manipulate the boom joystick 70
to drive a right traveling motor 50a. Therefore, at this time, the driver manipulates the
joysticks 70 and 70a instead of the acceleration pedals 70b and 70c to control the travel
of the heavy equipment.
In the long-distance traveling step S400, the controller 100 outputs a
manipulation signal according to a quantity of manipulation of the arm joystick 70a to
electronic proportional valves 90d and 90e for the left traveling motor, and outputs a
manipulation signal according to a quantity of manipulation of the boom joystick 70 to
electronic proportional valves 90f and 90g for the right traveling motor. At this point,
the manipulation signals inputted into the controller 100 according to quantities of
manipulation of the acceleration pedals 70b and 70c are neglected, so that the
manipulation signals are not outputted from the controller 100 to the outside.
As a result of determination in the foregoing function selection determining
step S200, when the joystick travel function is released, the display releasing step S500
and the work performing step S600 are sequentially performed.
In the display releasing step S500, the controller 100 releases the selected
joystick travel function state and the warning message which have been displayed on a
display device 110, thereby informing the driver that the joystick travel function is
released.
In the work performing step S600, the driver can manipulate the joysticks 70
and 70a to drive the boom and the arm, and can manipulate the acceleration pedals 70b
and 70c to control the travel of the heavy equipment.
In the working performing step S600, the controller 100 outputs a control
signal according to the manipulation signal of the arm joystick 70a to electronic
proportional valves 90b and 90c for an arm cylinder, outputs a control signal according
to the manipulation signal of the boom joystick 70 to electronic proportional valves 90
and 90a for a boom cylinder, and outputs control signals according to the manipulation
signals of the acceleration pedals 70b and 70c to electronic proportional valves 90d, 90e,
90f and 90g for the traveling motors.
A general characteristic of a secondary pressure of the electronic
proportional valves is plotted by a dotted line 'b' on a graph of Fig. 3. The dotted line
'b' indicates the characteristic of the secondary pressure at which hydraulic fluid is
linearly supplied to control valves 60b and 60c for the traveling motors according to the
quantities of manipulation of the joysticks 70 and 70a.
However, a solid line 'a' on a graph of Fig. 3 corresponds to an example
modified in such a way that, when the joystick travel function is selected, the secondary
pressure characteristic of the electronic proportional valves is controlled in a parabolic
form in order to improve precise manipulation capability and prevent impact on starting
the travel. In addition, it is possible to have control in various graph forms.
For this long-distance travel, the driver manipulates the joysticks 70 and 70a
to drive the left and right traveling motors 50 and 50a, thereby being capable of
traveling the heavy equipment. Therefore, it is possible to give the driver convenience
of manipulation.
As set forth above, the method for controlling the travel of the heavy
equipment with the joystick in accordance with the present invention has advantages as
follows:
The working unit such as the boom and the arm and the traveling unit can be
selectively driven by using the electronic joystick. Thus, the driver can control the
travel of the construction heavy equipment in a comfort sitting posture. In result, it is
possible not only to increase convenience of manipulation, but also to maintain a correct
driving posture during long-distance traveling. Thereby, it is possible to remarkably
reduce a fatigue of the driver.
Claims (3)
- A method for controlling travel of construction heavy equipment with joysticks, in which the construction heavy equipment has boom and arm joysticks outputting first manipulation signals according to quantities of manipulation in order to drive a boom and an arm, left and right acceleration pedals outputting second manipulation signals according to quantities of manipulation in order to drive left and right traveling units, a plurality of control valves controlling hydraulic fluid supplied to each of the boom, the arm and the left and right traveling units, and a plurality of electronic proportional valves operated by control signals outputted from a controller to control each of the control valves, the method comprising the steps of:inputting a joystick travel function selection signal, the first manipulation signals generated by the joysticks and the second manipulation signals generated by the acceleration pedals into the controller;determining whether a joystick travel function is selected or released from the joystick travel function selection signal;when the joystick travel function is selected, performing long-distance travel by preventing the control signal according to the second manipulation signals of the acceleration pedals from being outputted, by outputting the control signal according to the first manipulation signal of the arm joystick to the electronic proportional valves connected to the control valve for controlling the left traveling motor and by outputting the control signal according to the first manipulation signal of the boom joystick to the electronic proportional valves connected to the control valve for controlling the right traveling motor; andwhen the joystick travel function is released, performing a work by outputting the control signal according to the first manipulation signal of the arm joystick to the electronic proportional valves connected to the control valve for controlling an arm cylinder, by outputting the control signal according to the first manipulation signal of the boom joystick to the electronic proportional valves connected to the control valve for controlling an boom cylinder and by outputting the control signal according to the second manipulation signals of the acceleration pedals to the electronic proportional valves for the traveling motors.
- The method as claimed in claim 1, wherein the construction heavy equipment is provided with a display device for displaying information of the construction heavy equipment to a driver, and further comprising the steps of: when the joystick travel function is selected, displaying a state of the selected travel function and a warning message on the display device; and when the joystick travel function is released, releasing the state of the selected travel function and the warning message from the display device.
- The method as claimed in claim 1, wherein, in the step of performing the long-distance travel, a secondary pressure characteristic of the electronic proportional valves based on the manipulation quantities of the joysticks is controlled in a parabolic form in order to improve precise manipulation capability of the joysticks and to prevent impact from being generated on travel starting of the construction heavy equipment.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020040019259A KR100621980B1 (en) | 2004-03-22 | 2004-03-22 | Travel control method of construction vehicle with electronic joystick |
KR2004019259 | 2004-03-22 |
Publications (1)
Publication Number | Publication Date |
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EP1580334A1 true EP1580334A1 (en) | 2005-09-28 |
Family
ID=34858860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04027943A Withdrawn EP1580334A1 (en) | 2004-03-22 | 2004-11-25 | Method of controlling travel of construction heavy equipment with electronic joysticks |
Country Status (5)
Country | Link |
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US (1) | US7379806B2 (en) |
EP (1) | EP1580334A1 (en) |
JP (1) | JP4195433B2 (en) |
KR (1) | KR100621980B1 (en) |
CN (1) | CN100400896C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1818460A1 (en) * | 2006-02-14 | 2007-08-15 | Groupe Mecalac | Electro-hydraulic circuit for driving a construction machine |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4031746B2 (en) * | 2003-09-26 | 2008-01-09 | 三菱重工業株式会社 | Controller for large industrial vehicles |
JP4206099B2 (en) * | 2005-12-12 | 2009-01-07 | キャタピラージャパン株式会社 | Work machine |
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Also Published As
Publication number | Publication date |
---|---|
CN100400896C (en) | 2008-07-09 |
KR100621980B1 (en) | 2006-09-14 |
JP4195433B2 (en) | 2008-12-10 |
US7379806B2 (en) | 2008-05-27 |
KR20050094127A (en) | 2005-09-27 |
CN1673554A (en) | 2005-09-28 |
US20050209759A1 (en) | 2005-09-22 |
JP2005273443A (en) | 2005-10-06 |
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